'use strict';
const path = require('path');

function resolve(dir) {
  return path.join(__dirname, dir);
}

process.env.VUE_APP_TITLE = require('./package.json').description;
// vue.config.js 配置说明
// 官方vue.config.js 参考文档 https://cli.vuejs.org/zh/config/#css-loaderoptions
// 这里只列一部分，具体配置参考文档
module.exports = {
  // 部署生产环境和开发环境下的URL。
  // 默认情况下，Vue CLI 会假设你的应用是被部署在一个域名的根路径上
  // 例如 https://www.xx.cn/。如果应用被部署在一个子路径上，你就需要用这个选项指定这个子路径。例如，如果你的应用被部署在 https://www.xx.cn/admin/，则设置 baseUrl 为 /admin/。
  publicPath: './',
  // 在npm run build 或 yarn build 时 ，生成文件的目录名称（要和baseUrl的生产环境路径一致）（默认dist）
  outputDir: 'dist',
  // 用于放置生成的静态资源 (js、css、img、fonts) 的；（项目打包之后，静态资源会放在这个文件夹下）
  assetsDir: 'static',
  // 是否开启eslint保存检测，有效值：ture | false | 'error'
  lintOnSave: process.env.NODE_ENV === 'development',
  // 如果你不需要生产环境的 source map，可以将其设置为 false 以加速生产环境构建。
  productionSourceMap: false,
  // webpack-dev-server 相关配置
  devServer: {
    host: '0.0.0.0',
    port: '80',
    // 自动打开浏览器
    open: true,
    proxy: {
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      '/api': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/api': ''
        }
      },
      '/profile': {
        target: process.env.VUE_APP_BASE_API,
        changeOrigin: true,
        pathRewrite: {
          '^/profile': '/profile'
        }
      }
    },
    disableHostCheck: true
    // https: true,
  },
  css: {
    loaderOptions: {
      sass: {
        // 依次导入的公用的scss变量，公用的scss混入，共用的默认样式
        prependData: `@import "./src/styles/variables.scss";`
      }
    }
  },
  configureWebpack: {
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  chainWebpack(config) {
    // 修复HMR
    config.resolve.symlinks(true);
    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end();
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end();

    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ]);

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch');

    config.when(process.env.NODE_ENV === 'production', (_config) => {
      _config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end();

      _config.optimization.minimizer('terser').tap((options) => {
        options[0].terserOptions.compress.drop_console = true;
        options[0].terserOptions.compress.drop_debugger = true;
        return options;
      });

      _config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            // eslint-disable-next-line no-magic-numbers
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            // eslint-disable-next-line no-magic-numbers
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            // eslint-disable-next-line no-magic-numbers
            minChunks: 3, //  minimum common number
            // eslint-disable-next-line no-magic-numbers
            priority: 5,
            reuseExistingChunk: true
          }
        }
      });
      // eslint-disable-next-line no-sequences
      _config.optimization.runtimeChunk('single'),
      {
        from: path.resolve(__dirname, './public/robots.txt'), // 防爬虫文件
        to: './' // 到根目录下
      };
    });
  }
};